asterisk users - Jun 2005 - add/remove PRI card without rebooting

Hi

We are in a project where we will use asterisk as a residential gateway for 
IP phone service.

We are aiming to replace the primary phone line so the service must be up 
as long as possible so we are looking at ways to avoid shut downs.

We are looking for a solution to allow us to add/remove PRI cards without 
shutting down the asterisk system

Is there a solution that exist ?

Someone told me to look at the C-PCI technology, it seems that telecom 
companies use this.

Thanks

Patrick